At that evelvation your numbers are very strong. At 8,000 ft DAs a stock M3 would be doing 14-second quarter mile times and trapping at maybe 100mph.
Daily: 2013 e92 M3 MW FR DCT ZCP / ESS VT2 650 S/C, MRF mid/Akra slip, ST BBK
Track/Airstrip: 2011 997.2 Turbo S PDK / 501 AWHP & 536 AWTQ Bone stock on a Mustang dyno
Beater: 2013 X5 3.5sport